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CTCSS is an analog system. A later Digital-Coded Squelch (DCS) system was developed by Motorola under the trademarked name Digital Private Line (DPL). General Electric responded with the same system under the name of Digital Channel Guard (DCG).
Some DCS codes are inverted data of others: one code with the marks and spaces inverted may form a different valid DCS code (413 is equivalent to 054 inverted). Because of the use of the 136 Hz code, many receivers will decode a DCS signal when tuned to the CTCSS tone of 136.5 Hz (depending on receiver system tolerance).
DCS (Digital-Coded Squelch), generically known as CDCSS (Continuous Digital-Coded Squelch System), was designed as the digital replacement for CTCSS. In the same way that a single CTCSS tone would be used on an entire group of radios, the same DCS code is used in a group of radios.
Most analog two-way radios utilize a technology called CTCSS or DCS that helps block out unwanted transmissions. To make MURS two-way radios work together, they must have matching CTCSS or DCS tones. This can usually be done via basic programming which almost all MURS two-way radios support.
Family medical history FOH: Family ocular history F/U: Follow up appointment GH: General health G(M)P: General (medical) practitioner HA: Headaches HARC: Harmonious abnormal retinal correspondence HM: Hand motion vision – state distance Hx: History IOL: Intra-ocular lens IOP: Intra-ocular pressure ISNT: Inferior, Superior, Nasal, Temporal
Additional post graduate sponsors of the Certification Program include: Northwestern Health Sciences University, Life University, and Parker Chiropractic College. Previously the ICPA issued credentials of FICPA with similar requirements to the current CACCP and DACCP programs. [citation needed] DGCSS and FGCSS [28]
A spinal cord stimulator (SCS) or dorsal column stimulator (DCS) is a type of implantable neuromodulation device (sometimes called a "pain pacemaker") that is used to send electrical signals to select areas of the spinal cord (dorsal columns) for the treatment of certain pain conditions.
Or, a restaurant will use 467.7500 MHz to alert customers when their table is ready (using so-called "coaster pagers") while a department store nearby uses 467.7500 MHz for their in-store communications. In both of these examples, the department store is forced to use a squelch system such as CTCSS or DCS.